About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
Symposium
|
Materials
|
Presentation Title |
Fabricating Silicon Nitride Parts Using the Ceramic On-Demand Extrusion (
CODE) Process and Pressureless Sintering Method |
Author(s) |
Sachin Choudhary, Ming Leu, Austin Martin, Jeremy Watts, Gregory Hilmas, Tieshu Huang |
On-Site Speaker (Planned) |
Sachin Choudhary |
Abstract Scope |
Aqueous paste of silicon nitride was freeform fabricated using the CODE (Ceramic On-Demand Extrusion) process. The process utilizes solids loading of 52 vol% in the pastes, while using a small amount of organics in the form of dispersants and binder. Several competing dispersant candidates were characterized using zeta-potential measurements to select the most effective dispersant. The combined effects of dispersant, pH, and solids loading were optimized to produce pastes with a shear thinning rheology suitable for the CODE process. Through the layer-wise process, silicon nitride ceramic parts were fabricated without any compaction and subsequently fired to 99% of theoretical density using pressure less sintering method. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |